Answer: A-t-il besion d'un stylo?
Step-by-step explanation:
The inversion method takes the verb of the sentence and puts it before the subject pronoun, after the dash.
For example, Es-tu prêt? (Are you ready?)
However, when the subject pronoun starts with a vowel (i.e., il, elle, and on) we put a t between both words to not have two vowel sounds together, like this example.
Therefore, instead of a-il, we use a-t-il.
The sentence in inversion is A-t-il besion d'un stylo?